ipcalc

Calculate IP network information

TLDR

Calculate network info

$ ipcalc [192.168.1.0/24]

Show with netmask

$ ipcalc [192.168.1.0] [255.255.255.0]

Split network into subnets

$ ipcalc [192.168.0.0/16] -s [256] [256] [256]

Check if IP is in network

$ ipcalc -c [192.168.1.100] [192.168.1.0/24]

Show binary representation

$ ipcalc -b [192.168.1.0/24]

SYNOPSIS

ipcalc [options] address [netmask]

ipcalc calculates IP network information. It shows network address, broadcast address, host range, and other details from an IP address and netmask or CIDR notation.The tool is essential for network planning, subnetting, and troubleshooting IP configuration issues.

PARAMETERS

address

IP address with optional CIDR.

netmask

Subnet mask (if not CIDR).

-b, --broadcast

Show broadcast address.

-n, --network

Show network address.

-h, --hostname

Show hostname.

-s size...

Split into subnets of size.

-c, --check

Validate address.

--class

Show address class (A, B, C, D, or E).

--minaddr

Show minimum host address.

--maxaddr

Show maximum host address.

-4, -6

Force IPv4/IPv6.

-r, --random-private

Generate a random private address for given prefix length.

--no-decorate

Print output without decoration (suitable for scripting).

CAVEATS

Two distinct implementations exist: the Red Hat version (ipcalc from initscripts) and the newer ipcalc by Nikos Mavrogiannopoulos. They have different options and features. The `-s` subnet splitting and `-c` check options are only available in certain versions. IPv6 support is available in the newer implementation only.

HISTORY

ipcalc has multiple implementations. The original was part of the Red Hat initscripts package. A newer, more feature-rich version was written by Nikos Mavrogiannopoulos with IPv6 support and additional calculation features.